This was discussed (asked) many times. As far as I can remember, the previous 5 Forums software versions used to be: EST, EST, GMT, GMT, PST.
Anyway, the idea is that we used to have GMT. Of course it confused the North ? South American guys (although SAm were rare that time).
A decent implementation should have the Time-Zone preference in the User Profile. The Forum?s software implementation translates it in the user?s time zone preference. If the software doesn?t implement it, Je m'en fou because GMT, PST (in fact xST ) needs some mind calculation process for any guy outside the subjective chosen time-zone base.
Finally, although this shouldn?t be too difficult to implement, needing some code and of course the "Forums will be shut down for a while" well known message
(and the corresponding event), it shouldn?t be the first priority.
Cetin
Trying to unweave, unwind, unravel
And piece together the past and the future,
T. S. Eliot